Useful Sites for Student Practice

www.weeklyreader.com provides nonfiction reading in current events for science and social studies.
http://www.funbrain.com provides practice in most subject areas and grade levels
www.factmonster.com a great kidsafe reference site
www.oswego.org/ocsd-web/games/Mathmagician/cathymath.html timed math facts practice (all 4 operations)
np.harlan.k12.ia.us/reading_center.htm electronic high frequency words flashcards Must Have Powerpoint for the electronic flashcards to work. Click on the desired list.

http://www.enchantedlearning.com/Home.html this is my favorite website for locating materials for lower elementary students--There is a lot of online reading materials as well as printables. Most of the items are free.
http://www.mathfactcafe.com/build allows you to make printable math worksheets